Each set of 4 is handcrafted from a vintage map of Paris, giving them a very classic look and feel. They are sealed and waterproof so your wine won't harm your favorite drinking accessory. The back has 4 soft pads which won't scratch your table or deck. The tiles are a thick, sturdy Turkish Travertine Tile; not thin, cheap porcelain tiles. Each one is 4 inch by 4 inch.